1

Planning a diet?:
You're actually describing a rigorous weight-loss diet such as athletes undertake to make weight or fitness guys to "get ripped"; it would be an anorexic behavior if it became an obsession or you were likely to hurt yourself. You're at your physical prime and if you can adopt a fitness-focused lifestyle instead of episodic diet, it's be great. Your physician can help.
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A calorie is the amount of heat energy needed to increase a mililiter of water 1 degree centigrade, the calorie we talk about in foods is really a kilocalorie, that is the amount of energy needed to increase a liter of water 1 degree centigrade... So if you eat a food that is 500 calories that food if burned completely has enough energy to heat a liter of water 500 degrees centigrade.
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2

Counseling:
You need psychologic or psychiatric counseling badly since you may be anorexic. Aside from weight loss, you will have hormone issue, weakness, nutritional deficiency, nerve damages... And even death, just to name a few. Call for an appointment now.
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3

Possibly:
It might also mean you are sensitive to a particular food. If you're lactose intollerant, for example, you will getting bloating, gas and diarrhea after eating dairy. It's helpful to keep a food log and write down what you eat and when you have diarrhea. This will help you see what foods trigger the problem. If this has only been going on for a short time, it might be something viral.
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4

Muscle:
This can, however, be modified by mainly exercise. It is a bit more in the non-young (yay for you). It is also less in those like me who chronically restrict calories. There is adaption over weeks to increase the proportion of fat burned (yay me).
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Exercise and caloric:
Restriction. To effectively lose weight you need to do more physical exercise and reduce your caloric intake. To lose one pound you need to generate a negative balance of about 4500 calories. So reduce your caloric intake accordingly. It would be useful to consult a dietitian for advise on foods and quantity of foods.
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7

3500 deficit = 1lb:
Find some online calculators to help you calculate your daily energy expenditure with your form of exercise. So, if are burning 1800 calories each day, then you'll have a 500 cal deficit and lose 1pound each week.
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10

Not exactly:
Newer research suggests it is more complex than that. For instance, two people can eat the same amount of calories, all other things being equal, and show different amounts of wt gain or loss. This suggest people are different and even calories are different.
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11

9 calories per gram:
When you burn stored fat, it yields about 9 calories per gram of fat burned. It is important to not starve but maintain a certain base level intake of protein and carbohydrates as using fats alone will cause acidosis and other metabolic problems.
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13

Age, and gender:
Normal body functions require a baseline of energy- approx. 12-1600 cal based on age, ht/wt, gender and genetic predisposition. If you have chronically dieted, consuming less than 1200 cal/day your body will adapt and burn less. The concept of increase energy use- exercise with reduced calories should prove to be a vital combination to lose weight.
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Sorry, but...:
I can't answer that question because the assumption you make that "going into starvation mode" makes you "store fat" is incorrect. (Maybe I misunderstood what you were asking.) A very low caloriediet may slow down your metabolism as a protective mechanism against starvation but, if you're burning off more calories than you take in, you will lose weight (including fat).
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15

Fat caloric value:
A pound (454gm) of fat represents about 3500 calories (@ 9 kcal/gm). A kg is about 2.2 pounds, so that's 7700. Eating 175 fewer calories a day would mean losing a pound every 20 days. Or if you burned an extra 175 calories a day by exercising more, then you could lose a pound in about 20 days. The combination of both would accelerate and double that weight loss.
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18

This would be:
Somewhat debatable, but I am not comfortable with my patients consuming fewer than 1000 calories per day. That can be a safe level is it is balanced with protein, complex carbohydrates and healthy fats. Less than this and you risk malnutrition, lowering of metabolic rate and other serious complications. Even at 1000 cal/day you should get professional (doctor/dietitian) advice for safety. Good luck
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20

Largely true. ..:
In addition to taking in fewer calories and burning more, you may be able to slim or tone your thighs by doing some lower extremity weight training. This may result in developing the muscle in place of fat which which results in a slimmer profile. Make sure you don't under eat....lower ing your metabolic rate from taking in too few calories can sabotage your efforts. Good wishes:)
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21

Weight loss:
1st congratulations on 20 pound weight loss. But I am curious that you can't see/feel any difference. Certainly your clothes should feel looser, at least at waist. I would also expect you to report increase energy since you're lugging around less weight. Eating less & exercising more are basic tenets to weight loss but we usually recommend eating enough protein, not less. Chat w/your FamilyDoc
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22

Ketosis:
Some people will try to enter ketosis (through specialized diets or lengthy exercise) intentionally to better target "fat burning". Whether this is healthy and/or leads to sustained weight loss is controversial. But a calorie is a calorie, regardless of its storage or form. So you need a calorie deficit to lose weight. But it's not essential to be in ketosis to do this.
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23

No magic signs:
No magic signs, other than "keep up the good work." If you eat a healthy diet and burn more calories through exercise than what you take in, you will lose weight. Weigh yourself periodically and you can track your progress. Remember, "slow and steady" wins the race, ...you do not have to lose many pounds all at once. Best wishes.
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24

It's more complex...:
The human body likes to use glucose (a sugar, thus a carb), which comes from the food in the stomach & small intestine, and from the liver (where glucose is stored in a starch form called glycogen). As long as one is not eating enough to supply glucose to his cells, his liver will run low on glucose/glycogen, and his body will burn other fuels like fat (and even protein) to keep his cells working.
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25

Change proprtions:
To lose weight/fat we need to eat fewer carbohydrate and lipid calories getting fewer each day than we burn. To gain muscle mass and not weight we need to add protein and exercise the specific muscle groups we want to bulk up.
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26

Yes and no:
In men and women, resistance training combined with a healthy diet will build muscles....More in men than women but it works for both. Stronger muscles tend to burn more calories than weaker muscles even when you are not using them...That helps reduce fat. Lifting with proper form to the point of momentary failure plus a good diet seems to be the best way to get the muscles to respond.
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28

Unknown:
It was widely believed that the low carb, high fat, atkins diet would cause a marked increase in LDL cholesterol and heart disease but it didn't. If you're normal weight and exercising regularly, it may not matter what you're eating but this has not been conclusively proven. As a cardiologist, I do not recommend 50% of calories from sat. Fat but you can measure your own lipids & see for yourself.
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30

Probably, slowly:
Depending upon how restrictive is your diet, and how much fat you have lost, you can certainly expect some gain when resuming a more balanced diet. How soon you gain lost fat, would depend on different factors like your absorption or other GI health issues.
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